Re: with image and reversed x-axis

[Ethan A M. <merritt@u.washington.edu>]

On Thursday 02 November 2006 03:50 am, Petr Mikulik wrote:
> Here is a bug report from a user:
> 
> In the following script, the map (for a 3D file) is shifted in the opposite 
> (wrong) direction in the png output file compared to other terminals 

wxt and pdf give the same output as png
x11 and postscript give a different result, as you noted.

Which is correct?  So far as I can see, the documentation
says nothing about shifting the image if the axis is 
rescaled. So strictly speaking I don't think it is a bug
because there is no promise of any particular behavior.

Having said that, I find the wxt/pdf/png behavior more
expected. So if we change existing drivers to make them
consistent, I vote for changing x11 and postscript to match
the others ==>  always place the lower left corner of the
image at the requested coordinate origin.


> set xrange [20:-20]
> #set xrange [-20:20]
> 
> plot "a.dat" w image
> 
> set terminal png; set output  "s.png"
> replot
> set term postscript color; set out 'a.ps'; replot
> set term fig color; set out 'a.fig'; replot
> set out; set term pop
> 
> 
> Is it a bug in the gd terminal?
> 
> ---
> PM
> 
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-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742